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Direct linkLeifeng Xiao; Kit-Tai Hau; Melissa Dan Wang – Educational Measurement: Issues and Practice, 2024
Short scales are time-efficient for participants and cost-effective in research. However, researchers often mistakenly expect short scales to have the same reliability as long ones without considering the effect of scale length. We argue that applying a universal benchmark for alpha is problematic as the impact of low-quality items is greater on…
Descriptors: Measurement, Benchmarking, Item Sampling, Sample Size
NCME 2008 Presidential Address: The Impact of Anchor Test Configuration on Student Proficiency Rates
Fitzpatrick, Anne R. – Educational Measurement: Issues and Practice, 2008
Examined in this study were the effects of reducing anchor test length on student proficiency rates for 12 multiple-choice tests administered in an annual, large-scale, high-stakes assessment. The anchor tests contained 15 items, 10 items, or five items. Five content representative samples of items were drawn at each anchor test length from a…
Descriptors: Test Length, Multiple Choice Tests, Item Sampling, Student Evaluation
